Question

I am writing a C program that takes either command line arguments or has a file passed to it using < on the command line. My question is how do I check to see if there is a file passed using <. I think I need a way to check stdin to see if there is any data present.

Thanks

Answer 1

This can be done by checking the size of the given file.

FILE* fp = fopen(file_name, "r");

long int size = ftell(fp);

if (size ==0)

        printf("No data present here");

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